drivers/usb/host/ohci-platform.c

   1 /*
   2  * Generic platform ohci driver
   3  *
   4  * Copyright 2007 Michael Buesch <m@bues.ch>
   5  * Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
   6  * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
   7  *
   8  * Derived from the OCHI-SSB driver
   9  * Derived from the OHCI-PCI driver
  10  * Copyright 1999 Roman Weissgaerber
  11  * Copyright 2000-2002 David Brownell
  12  * Copyright 1999 Linus Torvalds
  13  * Copyright 1999 Gregory P. Smith
  14  *
  15  * Licensed under the GNU/GPL. See COPYING for details.
  16  */
  17
  18 #include <linux/clk.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/hrtimer.h>
  21 #include <linux/io.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/err.h>
  25 #include <linux/phy/phy.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/reset.h>
  28 #include <linux/usb/ohci_pdriver.h>
  29 #include <linux/usb.h>
  30 #include <linux/usb/hcd.h>
  31
  32 #include "ohci.h"
  33
  34 #define DRIVER_DESC "OHCI generic platform driver"
  35 #define OHCI_MAX_CLKS 3
  36 #define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
  37
  38 struct ohci_platform_priv {
  39         struct clk *clks[OHCI_MAX_CLKS];
  40         struct reset_control *rst;
  41         struct phy **phys;
  42         int num_phys;
  43 };
  44
  45 static const char hcd_name[] = "ohci-platform";
  46
  47 static int ohci_platform_power_on(struct platform_device *dev)
  48 {
  49         struct usb_hcd *hcd = platform_get_drvdata(dev);
  50         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
  51         int clk, ret, phy_num;
  52
  53         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
  54                 ret = clk_prepare_enable(priv->clks[clk]);
  55                 if (ret)
  56                         goto err_disable_clks;
  57         }
  58
  59         for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
  60                 ret = phy_init(priv->phys[phy_num]);
  61                 if (ret)
  62                         goto err_exit_phy;
  63                 ret = phy_power_on(priv->phys[phy_num]);
  64                 if (ret) {
  65                         phy_exit(priv->phys[phy_num]);
  66                         goto err_exit_phy;
  67                 }
  68         }
  69
  70         return 0;
  71
  72 err_exit_phy:
  73         while (--phy_num >= 0) {
  74                 phy_power_off(priv->phys[phy_num]);
  75                 phy_exit(priv->phys[phy_num]);
  76         }
  77 err_disable_clks:
  78         while (--clk >= 0)
  79                 clk_disable_unprepare(priv->clks[clk]);
  80
  81         return ret;
  82 }
  83
  84 static void ohci_platform_power_off(struct platform_device *dev)
  85 {
  86         struct usb_hcd *hcd = platform_get_drvdata(dev);
  87         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
  88         int clk, phy_num;
  89
  90         for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
  91                 phy_power_off(priv->phys[phy_num]);
  92                 phy_exit(priv->phys[phy_num]);
  93         }
  94
  95         for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
  96                 if (priv->clks[clk])
  97                         clk_disable_unprepare(priv->clks[clk]);
  98 }
  99
 100 static struct hc_driver __read_mostly ohci_platform_hc_driver;
 101
 102 static const struct ohci_driver_overrides platform_overrides __initconst = {
 103         .product_desc =         "Generic Platform OHCI controller",
 104         .extra_priv_size =      sizeof(struct ohci_platform_priv),
 105 };
 106
 107 static struct usb_ohci_pdata ohci_platform_defaults = {
 108         .power_on =             ohci_platform_power_on,
 109         .power_suspend =        ohci_platform_power_off,
 110         .power_off =            ohci_platform_power_off,
 111 };
 112
 113 static int ohci_platform_probe(struct platform_device *dev)
 114 {
 115         struct usb_hcd *hcd;
 116         struct resource *res_mem;
 117         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 118         struct ohci_platform_priv *priv;
 119         struct ohci_hcd *ohci;
 120         int err, irq, phy_num, clk = 0;
 121
 122         if (usb_disabled())
 123                 return -ENODEV;
 124
 125         /*
 126          * Use reasonable defaults so platforms don't have to provide these
 127          * with DT probing on ARM.
 128          */
 129         if (!pdata)
 130                 pdata = &ohci_platform_defaults;
 131
 132         err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
 133         if (err)
 134                 return err;
 135
 136         irq = platform_get_irq(dev, 0);
 137         if (irq < 0) {
 138                 dev_err(&dev->dev, "no irq provided");
 139                 return irq;
 140         }
 141
 142         hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
 143                         dev_name(&dev->dev));
 144         if (!hcd)
 145                 return -ENOMEM;
 146
 147         platform_set_drvdata(dev, hcd);
 148         dev->dev.platform_data = pdata;
 149         priv = hcd_to_ohci_priv(hcd);
 150         ohci = hcd_to_ohci(hcd);
 151
 152         if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
 153                 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
 154                         ohci->flags |= OHCI_QUIRK_BE_MMIO;
 155
 156                 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
 157                         ohci->flags |= OHCI_QUIRK_BE_DESC;
 158
 159                 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
 160                         ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
 161
 162                 if (of_property_read_bool(dev->dev.of_node, "no-big-frame-no"))
 163                         ohci->flags |= OHCI_QUIRK_FRAME_NO;
 164
 165                 of_property_read_u32(dev->dev.of_node, "num-ports",
 166                                      &ohci->num_ports);
 167
 168                 priv->num_phys = of_count_phandle_with_args(dev->dev.of_node,
 169                                 "phys", "#phy-cells");
 170
 171                 if (priv->num_phys > 0) {
 172                         priv->phys = devm_kcalloc(&dev->dev, priv->num_phys,
 173                                             sizeof(struct phy *), GFP_KERNEL);
 174                         if (!priv->phys)
 175                                 return -ENOMEM;
 176                 } else
 177                         priv->num_phys = 0;
 178
 179                 for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
 180                         priv->phys[phy_num] = devm_of_phy_get_by_index(
 181                                         &dev->dev, dev->dev.of_node, phy_num);
 182                         if (IS_ERR(priv->phys[phy_num])) {
 183                                 err = PTR_ERR(priv->phys[phy_num]);
 184                                 goto err_put_hcd;
 185                         }
 186                 }
 187
 188                 for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
 189                         priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
 190                         if (IS_ERR(priv->clks[clk])) {
 191                                 err = PTR_ERR(priv->clks[clk]);
 192                                 if (err == -EPROBE_DEFER)
 193                                         goto err_put_clks;
 194                                 priv->clks[clk] = NULL;
 195                                 break;
 196                         }
 197                 }
 198
 199         }
 200
 201         priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
 202         if (IS_ERR(priv->rst)) {
 203                 err = PTR_ERR(priv->rst);
 204                 if (err == -EPROBE_DEFER)
 205                         goto err_put_clks;
 206                 priv->rst = NULL;
 207         } else {
 208                 err = reset_control_deassert(priv->rst);
 209                 if (err)
 210                         goto err_put_clks;
 211         }
 212
 213         if (pdata->big_endian_desc)
 214                 ohci->flags |= OHCI_QUIRK_BE_DESC;
 215         if (pdata->big_endian_mmio)
 216                 ohci->flags |= OHCI_QUIRK_BE_MMIO;
 217         if (pdata->no_big_frame_no)
 218                 ohci->flags |= OHCI_QUIRK_FRAME_NO;
 219         if (pdata->num_ports)
 220                 ohci->num_ports = pdata->num_ports;
 221
 222 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
 223         if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
 224                 dev_err(&dev->dev,
 225                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n");
 226                 err = -EINVAL;
 227                 goto err_reset;
 228         }
 229 #endif
 230 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
 231         if (ohci->flags & OHCI_QUIRK_BE_DESC) {
 232                 dev_err(&dev->dev,
 233                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_DESC not set\n");
 234                 err = -EINVAL;
 235                 goto err_reset;
 236         }
 237 #endif
 238
 239         if (pdata->power_on) {
 240                 err = pdata->power_on(dev);
 241                 if (err < 0)
 242                         goto err_reset;
 243         }
 244
 245         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 246         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
 247         if (IS_ERR(hcd->regs)) {
 248                 err = PTR_ERR(hcd->regs);
 249                 goto err_power;
 250         }
 251         hcd->rsrc_start = res_mem->start;
 252         hcd->rsrc_len = resource_size(res_mem);
 253
 254         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 255         if (err)
 256                 goto err_power;
 257
 258         device_wakeup_enable(hcd->self.controller);
 259
 260         platform_set_drvdata(dev, hcd);
 261
 262         return err;
 263
 264 err_power:
 265         if (pdata->power_off)
 266                 pdata->power_off(dev);
 267 err_reset:
 268         if (priv->rst)
 269                 reset_control_assert(priv->rst);
 270 err_put_clks:
 271         while (--clk >= 0)
 272                 clk_put(priv->clks[clk]);
 273 err_put_hcd:
 274         if (pdata == &ohci_platform_defaults)
 275                 dev->dev.platform_data = NULL;
 276
 277         usb_put_hcd(hcd);
 278
 279         return err;
 280 }
 281
 282 static int ohci_platform_remove(struct platform_device *dev)
 283 {
 284         struct usb_hcd *hcd = platform_get_drvdata(dev);
 285         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 286         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 287         int clk;
 288
 289         usb_remove_hcd(hcd);
 290
 291         if (pdata->power_off)
 292                 pdata->power_off(dev);
 293
 294         if (priv->rst)
 295                 reset_control_assert(priv->rst);
 296
 297         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
 298                 clk_put(priv->clks[clk]);
 299
 300         usb_put_hcd(hcd);
 301
 302         if (pdata == &ohci_platform_defaults)
 303                 dev->dev.platform_data = NULL;
 304
 305         return 0;
 306 }
 307
 308 #ifdef CONFIG_PM_SLEEP
 309 static int ohci_platform_suspend(struct device *dev)
 310 {
 311         struct usb_hcd *hcd = dev_get_drvdata(dev);
 312         struct usb_ohci_pdata *pdata = dev->platform_data;
 313         struct platform_device *pdev =
 314                 container_of(dev, struct platform_device, dev);
 315         bool do_wakeup = device_may_wakeup(dev);
 316         int ret;
 317
 318         ret = ohci_suspend(hcd, do_wakeup);
 319         if (ret)
 320                 return ret;
 321
 322         if (pdata->power_suspend)
 323                 pdata->power_suspend(pdev);
 324
 325         return ret;
 326 }
 327
 328 static int ohci_platform_resume(struct device *dev)
 329 {
 330         struct usb_hcd *hcd = dev_get_drvdata(dev);
 331         struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
 332         struct platform_device *pdev =
 333                 container_of(dev, struct platform_device, dev);
 334
 335         if (pdata->power_on) {
 336                 int err = pdata->power_on(pdev);
 337                 if (err < 0)
 338                         return err;
 339         }
 340
 341         ohci_resume(hcd, false);
 342         return 0;
 343 }
 344 #endif /* CONFIG_PM_SLEEP */
 345
 346 static const struct of_device_id ohci_platform_ids[] = {
 347         { .compatible = "generic-ohci", },
 348         { .compatible = "cavium,octeon-6335-ohci", },
 349         { }
 350 };
 351 MODULE_DEVICE_TABLE(of, ohci_platform_ids);
 352
 353 static const struct platform_device_id ohci_platform_table[] = {
 354         { "ohci-platform", 0 },
 355         { }
 356 };
 357 MODULE_DEVICE_TABLE(platform, ohci_platform_table);
 358
 359 static SIMPLE_DEV_PM_OPS(ohci_platform_pm_ops, ohci_platform_suspend,
 360         ohci_platform_resume);
 361
 362 static struct platform_driver ohci_platform_driver = {
 363         .id_table       = ohci_platform_table,
 364         .probe          = ohci_platform_probe,
 365         .remove         = ohci_platform_remove,
 366         .shutdown       = usb_hcd_platform_shutdown,
 367         .driver         = {
 368                 .name   = "ohci-platform",
 369                 .pm     = &ohci_platform_pm_ops,
 370                 .of_match_table = ohci_platform_ids,
 371         }
 372 };
 373
 374 static int __init ohci_platform_init(void)
 375 {
 376         if (usb_disabled())
 377                 return -ENODEV;
 378
 379         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 380
 381         ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
 382         return platform_driver_register(&ohci_platform_driver);
 383 }
 384 module_init(ohci_platform_init);
 385
 386 static void __exit ohci_platform_cleanup(void)
 387 {
 388         platform_driver_unregister(&ohci_platform_driver);
 389 }
 390 module_exit(ohci_platform_cleanup);
 391
 392 MODULE_DESCRIPTION(DRIVER_DESC);
 393 MODULE_AUTHOR("Hauke Mehrtens");
 394 MODULE_AUTHOR("Alan Stern");
 395 MODULE_LICENSE("GPL");